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diff --git a/src/javascript/jsc/bindings/webcore/ActiveDOMCallback.h b/src/javascript/jsc/bindings/webcore/ActiveDOMCallback.h
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+++ b/src/javascript/jsc/bindings/webcore/ActiveDOMCallback.h
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+/*
+ * Copyright (C) 2010, 2012 Google Inc. All rights reserved.
+ * Copyright (C) 2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "ContextDestructionObserver.h"
+
+namespace JSC {
+class AbstractSlotVisitor;
+class SlotVisitor;
+}
+
+namespace WebCore {
+
+class ScriptExecutionContext;
+
+// A base class that prevents binding callbacks from executing when
+// active dom objects are stopped or suspended.
+//
+// Should only be created, used, and destroyed on the script execution
+// context thread.
+class ActiveDOMCallback : public ContextDestructionObserver {
+public:
+    WEBCORE_EXPORT ActiveDOMCallback(ScriptExecutionContext*);
+    WEBCORE_EXPORT virtual ~ActiveDOMCallback();
+
+    WEBCORE_EXPORT bool canInvokeCallback() const;
+
+    WEBCORE_EXPORT bool activeDOMObjectsAreSuspended() const;
+    WEBCORE_EXPORT bool activeDOMObjectAreStopped() const;
+    
+    virtual void visitJSFunction(JSC::AbstractSlotVisitor&) { }
+    virtual void visitJSFunction(JSC::SlotVisitor&) { }
+};
+
+} // namespace WebCore